CL is a great place to get a good deal but absolutely shit to try to sell anything and people will try to lowball the fuck out of you. I had my 70-200 f4L IS up for 6 months at 500 bucks and people were offering me 200 and 250 for it. I sold it on ebay in a week for 525.
That being said almost 90% of my entire loadout was bought on Craigslist all across the country, with the exception of my Df, 50 1.4, F100 and 75-300.
Some shit to watch for.
Everything this guy said
>>3138168 and the following
Check lenses for fungus, even a small amount can be a deal breaker if it sits in your bag long enough, on the flipside if you're brave and can kill it by sitting it in the sunlight for a bit, you can legitimately lowball someone over lens fungus and get an awesome deal especially if it doesn't affect image quality.
Check for fungus in the finder too, not really a problem on anything made in the last 20 years but if a lens had fungus and sat in a bag with a body that fungus can spread to other lenses if left long enough.
If the serial number has been defaced, it's stolen.
Check lenses for infinity focus too. Check AF lenses for focus accuracy, obviously f1.4 and below lenses may miss by a hair that's normal in some cases and newer cams can finetune focus in body.
Check filter threads on lenses for drop damage. Check the outside of the lens for it too.
A big one for older lenses, check the aperture for snappiness. Older lenses that have sat for long periods of time can get oil on the blades and won't close the aperture fast enough during the time of exposure and your image will be overexposed. Oil on aperture blades is only a dealbreaker on TTL lenses, anything super old school like Leica or Soviet LTM rangefinders usually have oil on the blades anyway because they are manual diaphragms and stay closed through the entire exposure mechanism.
